youio are looking at tamerlan tsarnaev, he is suspect number one. the one in the white hat is his younger brother, 19-year-old dzhokhar tsarnaev. the older brother was killed in a spectacular fire fight with police overnight. it all began in cambridge about 10:30 last night, an mit campus police officer was killed apparently in a confrontation with the two young men. they then carjacked a car, a chase ensued and that pursuit ended up in watertown, massachusetts where they have been in lockdown since after midnight. that police officer died, a second police officer in the midst of that chase was also gravely injured. this morning he was still in surgery. police say 19-year-old dzhokhar escaped from the confrontation, apparently still in the car. they now believe that perhaps he may have gained a second vehicle. they are searching for a gray honda cr-v with massachusetts license plates 3r689 a second suspect may have been involved and may have boarded a train and headed south from boston. they did stop an amtrak train in connecticut, but apparently di